It is hard to be successful at both study and club activities.

He is trying to maintain two jobs.

Especially over the last 20 years, the purported link between progressive welfare policies and economic failure in the Northern European countries seems to point to the difficulty of sustaining both full social welfare and international competitivity.

Health coexists with temperance.

How difficult a thing it is, to love, and to be wise, and both at once.

And at times when I became discouraged with trying to reconcile working and bringing up children, it was my husband who helped to maintain my determination.